<%@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" pageEncoding="utf-8"%>
<%!
//随机获取图片颜色
Color getRandColor(int fc,int bc){
	Random random = new Random();
	if(fc>255) fc=255;
	if(bc>255) bc=255;
	int r=fc+random.nextInt(bc-fc);
	int g=fc+random.nextInt(bc-fc);
	int b=fc+random.nextInt(bc-fc);
	return new Color(r,g,b);
}
%>
<%
//response设置
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);

//设置图片大小
int width=60, height=20;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

//Graphics图片对象
Graphics g = image.getGraphics();


Random random = new Random();

g.setColor(getRandColor(200,250));
g.fillRect(0, 0, width, height);

g.setFont(new Font("Times New Roman",Font.PLAIN,18));

// 设置图片中的随机数
g.setColor(getRandColor(160,200));
for (int i=0;i<155;i++)
{
    int x = random.nextInt(width);
    int y = random.nextInt(height);
	int xl = random.nextInt(12);
	int yl = random.nextInt(12);
    g.drawLine(x,y,x+xl,y+yl);
}

String sRand="";
for (int i=0;i<4;i++){
    String rand=String.valueOf(random.nextInt(10));
    sRand+=rand;
    g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));//µ÷ÓÃº¯Êý³öÀ´µÄÑÕÉ«ÏàÍ¬£¬¿ÉÄÜÊÇÒòÎªÖÖ×ÓÌ«½Ó½ü£¬ËùÒÔÖ»ÄÜÖ±½ÓÉú³É
    g.drawString(rand,13*i+6,16);
}

// 把随值数放入SESSION
session.setAttribute("Code",sRand);

g.dispose();

ImageIO.write(image, "JPEG", response.getOutputStream());
out.clear();
out = pageContext.pushBody();
%>